the 167,000-pound spaceship is heading to its last stop, the california science center. moving at 2 miles per hour endeavour should finish the trip late saturday night. the flatbed is not controlled with a steering wheel. it's operated with joysticks. the transporter's wheels can move in any direction. >> it's an engineering marvel. >> reporter: endeavour flew 25 missions, more than 123 million- miles in space before it was retired with the rest of the shuttle program last year and the final 12-mile trip through the city is no easy mission. more than a dozen agencies are involved from police to power companies. crews took down trees and traffic signals and utility lines, so the shuttle's five- story tail could move through. the streets are reinforced with steel plates so the shuttle and its heavy carrier don't crack underground pipes. residents will have to put up with traffic jams and temporary power outages before endeavour reaches its final destination. bigad shaban, cbs news, los angeles. >> the estimated cost of moving the shuttle across town is more than $10 millio